Expansion-pulley



(No Model.) B P, .AU T ENRIBTH- EXPANSION PULLEY. 7

No. 898,802. Patented NovQ 27, 18.88.

N PETERS. mwum nmr. Washington. ma

UNITED STATES PATENT OFFICE.

ERNST F. AUTENRIETH, OF NEW YORK, ASSIGNOR TO THE GLEN COVE MACHINECOMPANY, (LIMITED,) OF GREEN POINT, BROOKLYN, YORK.

EXPANSlON-PULLEY.

SPECIFICATION forming part of Letters Patent No. 393,602, dated November27, 1888.

(No model.)

To aZZ whom it mea /concern:

Be it known that I, ERNST F. AUTENRIETH, ofthe city and county ofNewYork,in the State of New York,have invented a new and useful Improvementin Expansio11-Pulleys,of which the following is a specification,reference being had to the accompanying drawings.

My invention relates to that class of expansion-pulleys in which aseries ofsegmeni -pieces [0 for forming portions of the periphery of apulley are arranged on a face-plate, disk, hub, or center piece,which isor may be fixed to a shaft, and are caused to move simultaneously towardand from the said hub, center piece, or shaft [3 by the operation of acollar or hub fitted to slide on and turn with the same shaft andconnected with the segments by a series of extension-rods.

I will now proceed to describe the improvement, and will afterward pointout its novel features in claims.

In the drawings, Figure l is an end view of a fully-extendedexpansion-pulley embodying my invention, and Fig. 2 is a similar View of2 5 the same pulley in its most contracted condition. Fig. 3 is a planor face view corresponding to Fig. 1, and Fig. is a horizontal sectionon line 00 a; of Fig. 2.

Like letters of reference indicate correspond- 0 ing parts in all thefigures.

A designates a fixed hub or center piece having attached to it a seriesof tangential arms, B, united by a rim, a, the said arms and rimconstituting a face-plate. The said arms 3 5 are grooved or slotted toconstitute tangential guides for a series of segment-pieces, O,wh1ch arefitted to their slots or grooves. These segment-pieces form portions ofthe periphery of a pulley, and are capable of sliding along the 4.) saidguides toward and from the hub or center piece, A. i

D indicates a shaft, upon which the hub A may be fixed, and isrepresented as so fixed in the drawings.

5 E indicates ahub or collar concentric with and movable toward and fromhub A, which collar or hub E is also represented as fitted to slide uponand turn with shaft D.

G designates extension-rods of a series pivotally connected with saidsegmentpieces O and said movable hub E, to move in planes tangential toa circle cencentric with said hubs A and E.

H H indicatelngs formed on and projecting from each segment 0, andfitted to move in the corresponding guide-slots B B of the faceplate ordisk. Upon each of said segments or lugs is a wrist-pin, b.

c 0 indicate wrist pins projecting radially from hub E, and the relativeposition of the hubs on the shaft and the direction of the slots orgrooves or guides B B are such that each wrist-pin c is always parallelto the corresponding wrist-pin b, as is requisite and necessary in orderto place thereon the several extension-rods G, by which said. wrist-pinsare connected.

The out-er or working faces of the segmentpieces are formed concentricwith the hub A, and are portions of a cylinder of a radius correspondingto an intermediate position of said segments between the extremes ofexpansion and contraction represented in Figs. 1 and 2. Thesegment-pieces move from and towardthe center of hub or shaft on radiallines, thus pre- 7" serving always their concentricity, and the severalguides or guide grooves or slots B B are parallel with the respectiveradial lines upon which the segments move, and are consequentlytangential to a circle concentric with said hubs. The radial wrist-pinsof the sliding hub are at the same distance from the axial line as arethe wrist-pins of the lugs, and consequently the central lines of theguideslots are in the central plane of the movements 8 5 of therespective extension-rods. By this arrangement of the parts less forceapplied to the hub E will be required to sustain or counteract thepressure of a belt on the face of the segments when the pulley is inuse, and 0 the said hub may be placed closer to the faceplate than ifthe extension-rods were arranged to move in lines or planes radial tothe axis of the shaft. The segment-pieces are retained in the guidegrooves 0r slots B B by plates (Z and 5 screws 0.

f is a feather on the shaft D, fitting a groove in the sliding hub E, toprevent the hub from turning on the shaft.

The hub E may be operated and held in any suitable manner-as, forexample, by a shifterrod, 9, operating a forked bell-crank, h, piw

said fixed hub, and a series of rods connected with said segment-piecesand said movable hub, to move in planes tangential to a circleconcentric with said hllllS, substantially as herein described.

2. The COI1lbllllLiOl1,\Vlllll a faceplate and a series oftangentially-arranged guides formed 20 thereon, and a series ofsegment-pieces fitted to slide along said guides, of a shaft upon whichsaid faceplate is secured, a hubor collar fitted to turn with and slideupon said shaft toward and from said plate, and a series of rodspivotally 25 connected with said segment-pieces and said movable hub orcollar, to move in planes tangcntial to a circle concentric with saidhub and shaft, substantially as herein specified.

ERNST F. .-'\UTEXRIIC'PII.

\Vi t n esses:

FREDK. IIA YNES, .losnrn W. lion.

